BULLETIN NO. 1126F
DATE: 5/13
PERMANENT
DEEP DRAW DRUM
INSTRUCTIONS
DESCRIPTION
The Deep Draw Drum is a self-cleaning permanent type magnetic
separator that’s designed and constructed specifically for very
heavy duty applications. It separates small and large pieces of
ferrous material from products such as solid waste ash, shredded
automobiles, slag and crushed ore.
This large and powerful magnetic drum operates as a motor driven
stainless steel shell revolving around an internal stationary magnet
and shaft assembly. Material to be separated is fed against the
shell that’s protected by a heavy duty manganol steel wear cover,
welded in place. Magnetics in the field are attracted to the shell, and
held against it until reaching a discharge location. The separated
magnetics are then automatically released.
The Deep Draw Drum is available from Dings as a drum only, or with
a complete horizontal I-beam support frame that includes a drive
motor, drive chain and a guard. Two shaft clamps and a magnet arc
Figure 1
adjusting arm are included with the drum assembly in either case.
CAUTION: STRONG MAGNET
IMPORTANT
Strong magnetic field may have an affect on pacemakers and other
electrical devices. Please contact the device manufacturer for further
information. Be careful with hand held tools near it, whether the
drum is operating or not. Stay away from moving members when it
is operating.
Always switch off the drive motor and magnet before adjusting
any part on the drum, the drive or the support structure. A motor
lockout system should be used during servicing - during any
adjustments and during any maintenance.
The internal stationary magnet assembly projects a powerful
magnetic field through the drum shell, and out into the space
several inches away from the shell. Be cautious when handling or
even carrying tools near the shell. If a tool that’s made of magnetic
metal (most steel alloys are) is brought within the magnetic range, it
can be attracted suddenly and with great force towards the shell.
The magnetic field is highly attractive, and is always present.
Magnetic performance may be affected by magnetic material in the
field. This includes such items as i-beams, metal supports, hoppers,
or splitters. These and other ferrous objects need to be kept out of
the magnetic zone.
If the separator consists of a drum assembly only, it will be up to the
installer or user to furnish mounting, framing and drive components.
If a Dings horizontal support frame was supplied by Dings, read
Section 2 after reading Section 1.
SECTION 1
MOUNTING - DRUM ONLY
Check all packaged material for shortage of parts and possible
damage. Report shortages or damage to the delivering carrier.
The drum assembly is usually shipped banded to a wood skid.
The Deep Draw Drum is shipped assembled and ready to mount on
a support structure provided by the installer or user at the work site.
Bolt the lower sections of the 2 split shaft clamps that were included
with the drum shipment to the support structure as shown in Figure
2. Slotted holes are recommended in the support structure to allow
lateral adjustment of the drum. Any vertical adjustment that might
later be needed can be handled with shims (not provided by Dings).
OPERATING TEMPERATURE:
Ceramic magnets: -40°F through 250°F (-40°C through 120°C).
Rare earth magnets: 176°F (80°C) or less.
NOTE: Extreme temperatures may affect the performance of the
magnet. Refer to Bulletin 1214T.
IMPORTANT
This instruction bulletin has 2 sections. Section 1 covers the
installation and operation of the Deep Draw Drum assembly only supplied by Dings without a support frame. Section 2 covers additional instructions about installing and operating the drum when it’s
supplied by Dings with a support frame.
Read Section 1 before installing either a drum assembly or a drum
assembly that has a Dings supplied horizontal support frame.
4740 W. Electric Ave. s Milwaukee, WI 53219 s 414/672-7830 s 414/672-5354 Fax s www.dingsmagnets.com
Tighten the lower sections of the shaft clamps, and then slowly
lower the drum into them. When the shaft is supported in the lower
sections, bolt the upper sections loosely in place as show in Figure
3. Do not tighten the upper sections at this time, because they must
be loose to rotate the shaft while adjusting the magnet arc, as
explained next.
4) When the magnet position is correct, tighten bolts in the
upper sections on both shaft clamps while the adjusting arm
is held in position by the come-along or crane. If more
adjustment is needed, repeat steps 1 through4.
5) After a magnet position is set, remove the come-along or
crane, and also the adjusting arm.
It may be necessary later to reposition the arc slightly for peak
performance after material is run on the drum. Repeat the 5
adjusting steps for peak performance, but during Step 3, check if
the adjusting arm should be moved down slightly instead of up.
After the arc is finally set, consider leaving the adjusting arm on the
shaft, and welding a steel plate on the drum support structure to
act as a rest. This will prevent the internal magnet assembly from
slipping out of position, if the shaft clamp bolts accidentally loosen
from vibration.
FEED TO DRUM
Peak performance depends not only on the position of the magnet
arc. It also depends on these features: size of feed materials; distance or gap between the feeder and drum surface; rate of feed;
how constant the rate is kept; and whether the feeder trough is
made of a nonmagnetic type metal.
ADJUST MAGNET ARC - DRUM ONLY
The Deep Draw Drum is shipped with the internal magnet assembly
in the lowest or resting position as shown in Figure 4. After the
drum is mounted, the position of the internal magnet must be
adjusted to set the external magnetic arc in a correct operating
position.
The feeder trough or plate must be made of a nonmagnetic metal
such as Series 300 stainless steel. If instead it’s made of common
carbon steel, the portion that is situated within the magnetic field
(inside the arc) will become magnetized. When this happens,
efficiency of magnetic separation goes down.
If your drum will be fed as in Figures 5 or 6, the gap between the
discharge edge of the feeder and the drum shell is important. It must
be wide enough to allow all nonmagnetics in the feed to fall through
while the drum is operating. It must not be too wide which can
cause a loss of magnetic material.
The maximum width of the gap depends on the magnetic strength
of the drum which is a function of diameter. No specific gap
dimension is included in this bulletin. The gap for your installation
was predetermined at the time of drum selection. Be sure you
know what the determination was.
Several possible arc positions are shown in Figures 5, 6 and 7. A
selected position for your application was predetermined before
shipment. It was based on the location of your feeder, and on other
application factors. Be sure you know which arc position was determined for you installation, before adjusting the internal magnet as
explained next.
Follow these steps when adjusting the magnet arc the first time:
1) Check bolts holding the upper sections on both shaft
clamps. The upper sections should be loose, but don’t
remove the bolts.
2) Mount the adjusting arm that was packed with the drum, on
either end of the drum shaft, in a horizontal or slightly below
horizontal position.
3) Use a come-along, winch or crane as shown in Figure 4
to raise the adjusting arm to a magnet position that was
predetermined for your installation. An arrow is stamped
on each end of the drum shaft. It indicates the center of
the magnet arc. The center is magnetically the strongest
location across the drum surface.
If your drum will be fed as in Figure 7, the distance between the discharge edge of the feeder trough or plate, and the shell below,
should be as short as possible. Feed material must not be allowed
to drop more than a few inches against the shell, to avoid denting
the shell. A dent can damage the internal magnet assembly. If the
feeder has to be higher above the drum, install a nonmagnetic stainless steel chute at an angle that will allow the feed to slide down to
the shell.
Maximum magnetic separation occurs when the peripheral speed of
the drum is between 200 and 250 fpm. The corresponding rotational
speeds are:
32 to 40 RPM for a 24” diameter drum
25 to 32 RPM for a 30” diameter drum
21 to 26 RPM for a 36” diameter drum
18 to 23 RPM for a 42” diameter drum
16 to 20 RPM for a 48” diameter drum
13 to 16 RPM for a 60” diameter drum
MAINTENANCE
The Deep Draw Drum does not require extensive maintenance
other than periodic greasing of bearings, and inspection of the wear
cover.
Two external bearings on the drum heads have alemite grease
fittings. Lubricate them in your normal lubrication schedule, with
grease conforming to NLGI Grade 2. However, if conditions are
very dirty, lubricate at least every 2 weeks.
Watch for excessive wear on the manganol steel wear cover.
Although extremely resistant to wear, it can be dented by large
heavy pieces falling on it. Severe dents can cause damage to the
internal magnet assembly.
Replacement wear covers, complete with pre-welded cleats, are
available from Dings. They’re furnished as 2 semicircular halfcovers that must be tack welded in place. Follow these steps to
replace a wear cover:
SPLITTER
A splitter plate (not supplied by Dings) should be installed below
your drum as shown. It’s an aid to keeping the nonmagnetic
product separate from the magnetic product, after these products
are discharged from the drum.
The splitter should be made of nonmagnetic metal, and it should be
at least as wide as the drum shell. Make it adjustable vertically and
horizontally. Adjust it when material is running over the drum, for
maximum separation of the discharged products.
DRUM DRIVE
The Deep Draw Drum is usually furnished by Dings without a motor
and drive. However, the drum is always furnished with a split
sprocket bolted to one side. A matching drive sprocket and roller
chain must be used to drive the drum.
See your certified print of a Dings drawing for more details about the
sprocket. Sheave and belt-driven drums are available as options at
time of order. The certified print has more details about this.
1) Grind off all welds holding the worn cover - the welds along
both seams that cross the face, and the welds on the sides
where the wear cover butts against the drum heads.
2) Put replacement cover on drum shell, temporarily banding it
in place.
3) Rotate drum shell so that all welding will be done on the
side opposite the magnetic field (magnet arc).
4) Weld replacement cover in place with a 304 SS or chrome
manganese rod, using maximum 3” to 4” long welds along
both seams, every 10”. Tack weld at several points where
the cover butts against the drum heads.
TROUBLE SHOOTING
If there is a sudden and excessive drop in the amount of magnetics
separated, it is possible that the internal magnet assembly slipped
out of position. This would cause the magnet arc to be in the wrong
position. Check the magnet arc position according to instructions in
earlier paragraphs.
If the drum shell does not revolve freely, or there is noise when
the shell revolves, there is internal interference between the shell
and the magnet assembly. A slight ticking sound at one point that
does not interfere with rotation is not serious. The cause will wear
away. However, any loud noise or internal rubbing that does impede
rotation should be reported to Dings.
SECTION 2
IMPORTANT
This section covers additional instructions that should be followed
to install and operate the Deep Draw Drum when it is supplied by
Dings with a horizontal support frame as shown in Figure 8. Read Section 1 before Section 2.
DRUM DRIVE - MOTOR, WIRING, CHAIN
A gearmotor is furnished with the drum/frame assembly. It was
sized to suit the drum diameter and expected loading. The standard
motor is a TEFC parallel shaft gearmotor that operates on 230/460
volt 3ph 60Hz.
Motor speed, drum sprocket and motor sprocket were matched at
the Dings factory to produce the correct rotational speed for the
drum diameter. An instruction booklet cover the gearmotor was
attached to the motor when shipped from Dings. If the booklet is
missing, call the Dings sales department for a copy.
Follow the wire connection diagram on the motor nameplate. Be
sure to provide overload protection. After the motor is connected to
a power supply, jog the motor on and off to see if the drum shell
rotates in the correct direction. If the direction is wrong, reverse any
2 wire connections.
The separator was shipped from Dings with the correct amount of
tension on the drive chain. However, the motor mounting bolts
could have loosened during transit. Check chain tension before
operating the drum. The chain should be taut. If it needs tightening,
loosen bolts holding the motor in place, slide motor as needed to
tighten chain, and tighten bolts securely. Remember to remount
the chain guard after adjusting the motor base. Be sure the chain
doesn’t hit the guard when the drum is in motion.
ORDERING PARTS
Replacement parts can be order by mail, or by phoning a local
Dings representative, or the Dings factory. All parts are shipped
from the factory. Please provide a serial number from the nameplate on the Deep Draw Drum whenever possible.
You can call the factory in Milwaukee, Wisconsin at 414-672-7830
between 8:00 AM and 4:30 PM central time, Monday through Friday.
Tell our operator that you want to speak to someone about parts for
a magnetic separator.
MOUNTING - DRUM SUPPLIED WITH FRAME
The Deep Draw Drum and frame are shipped assembled, ready to
mount on a support structure or by suspension from an overhead
support structure. A support structure at the work site is provided by
the installer or the user. Four support lugs are furnished on the
frame for a suspended installation.
Install the drum/frame assembly with the frame level. If the assembly
will be suspended, use 4 parallel wire rope or chain slings with turnbuckles for easy vertical adjustment.
DECOMMISSIONING
If the separator will be taken out of service and decommissioned,
care must be taken in the disposal of component items. The drive
system (motor, gearbox, etc.) should be disposed of as you would
any electric motor. Frame components are carbon steel and can be
processed by a qualified recycler. The drum itself contains strong
permanently magnetized ceramic magnets. The magnetic field is
always present and projects out into the space several inches away
from the shell. Proper care must be taken in handling and
transporting the equipment. If the drum will be recycled, the
recycling operator must be made aware of the magnetic properties
of the separator.
ADJUST MAGNET ARC
Follow instructions in Section 1.
FEED TO DRUM
Follow instructions in Section 1.
SPLITTER
Follow instructions in Section 1.
4740 W. Electric Ave. s Milwaukee, WI 53219 s 414/672-7830 s 414/672-5354 Fax s www.dingsmagnets.com